Type-writing machine.



U. GIBBS.

TYPE WRITING MACHINE.

APPLICATION FILED JAN.14,1910.

Patented Nov. 8, 1910.

which regulatee the tension of-the springs;

UNITED STEiEES' PATENT OFFICE.

CHARLES GIBBS, OF NEW YORK, N. Y., ASSIGNOR T0 UNDER'WOOD TYPEWRITER 00M- IP ANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

TYPE-WRITING MACHINE.

Specification of Letters Patent.

Patented Nov. 8, 1910.

Application filed January 14,1910. SerlalNo. 538,054.

To all whom it may concern:

Be it known that I, CnAnL'ns G nBs, a.c-1t1- zen of the-lnited States residin in the borough of Bronx, city oflTew Yor lc, 1n the county of New York and'State of New York, have invented rertn'in. new and usefnl Improvements in Typeriting Maelnnes, of which the following is a-sp'ecificatlon.

This invention relates to pressure feed rolls associated with" the usual'cyl ndricalplatens of writing. machines A roll or. rolls, are usua'll mounted uponai shaft extending parallel with the latter: and held in swingr ;a rms eo'ntroll by a. reg leasekey, there in' usually twosuchroll shafts, rind separate y ad ustehleg springs being usually provided to ect i upon each shaft. e u

The object of this invention is theprovision of an improved end simpllfied nieclla= nism to enable the userto regulate the de: greeof pressureot the #rolls without (115%) inantli'ng ,any portion of the machine, and to maintaina uniform pressure 'off all the rolls one shaft.

I'mount the springs for; {troll or a slngle series offrolls-on a shaft,""the turning of and as such springs. are of uniform strength, uniformity of pressure isjireservedatall variations in the adju'strnent of the springs." A device carried by the shaft engages a part on the'platen frau-ie. to maintain "the springsunder tension.

The outer endof eaclrspring ashaffis formed or fitted to be engaged by a rotating key or other tool,iwhcrehy thetensio'n may he re ulated; .Sneh en agementa'may be effecte without dismant ing any'part-of the niachine.-

In the aqcompnnying -drawings, Figure 1 is a bottoinyvicw of the platen frame of an- Underwood front strike" writing. machine, illustratingoneeinbodiment ofmy in'ven-" tion. Fig. 2 is a erossseetional view of the pressure roll mechanism in normal position. Fig. 3 is & similar-viewshowing the rolls released from the platen. Fig. 4 is a. detail view showing thelock for the tension shaft,- released.

The axle 2 1n .the ends 3, 4 of aplaten-frsrme, which are rigidly-connected by a rod 5 be sure rolls 1O 11 are each roll of: the series will every other roll of the even, accurate feed of 'causes their. free "ends v the "tension shaft 13 laten i is usually mounted un neath the platen..- Forward-end rear-prescarried by shafts 8, 9

lyin 'parallel with the platen and supported in orwardly and rearwardly extending arms 6, 7, hinged on the rod 5. To hold the .rear roll or rather the series of feed. rolls 11 against the platen'so that r'ess against the platen with substantially tl ie series, to effect an the paper, springs 15, 16, of-unifornr stren a= manner to press the s aft 9 and its rolls toward the platen; and 'to enable the opera ,tor; to re'gulate'thepressure :on' the entire series of '.rolls-siniultaneously,'I' coil such springs around a tension regulating shaft '13,'-.-journ aled'inbearings 14, one end of each spring bein 17, thebuter en 5 18 of the springs pressing against the rearwardly-extendin osite en s'of the roll ca-rrying shaft 9.

; e-- outer-for freefeiids 18' of"the springs hevari'edin some'ces'es. V p v The pressure-is regulatedby': rotating the shaft '13 (see the arrow in Fig. 4). This placesb'oth springs 15,

18 to react against the arms 7, 7, such pressure being transm' ittedto the shaft 9 to press all the rolls 11 'of the'series a ainst the platen with approximately e nail force."

The shaft 131s prevented from rotating in the opposite r1ire.ction byalocking device comprising a. stationary crown ratchet 19 engaged 'by' a: detent 2O, in crownl'atchet wheel, on the shaft 13.

th, are mounted 1n connected to the shaft at roll-" lsupporting farnis 7, '7, located near t cop 16 under tension and,

same force as the shape of a To enable the operator to readily regulate the pressure of thcro'lls againstthe platen, is extended .to a point adj'aeent-oneend 3 of the platen frame, and ma? be provided with ing inc ined teetli to be engaged by a. key

-24, havingn similar]? toothed bib 25, "(see dotted lines in Fig. 4) to wind the shhft to increase the tension. Theinclination of the teeth of the ratchet 21 and key 24'prevents strain on the shaft, from zi'n-"fi ttempt to turn the latter backward" as ii such event, the key will slip idly over the teeth of the windmg ratchet.

a ratchet 21 hav-' hen the shaft is turned by the key 24.,

to increase the spring-tension, the detent rides idl over the teeth of the locking ratchet, tlie shaft-13 movin endwise in its bearings 14 to permit sue 1 action, after which the pressure of the tool 24 on the ratchet 21 rengages the detent .and locking ratchet, and presses the shaft back endwise. A The tension shaft 13 may he slid endwise inits hearings (see Fi 4) to disengage the locking mechamsm, wh reupon thesprings will unwind until they have lost their tension, rotating the shaft backwardly; after which the" springs may be wound up to a less degree if desired, and the clutch members 19, 2O ren'gngedto maintain the springs under tension; or the unwinding of the shaft may be controlled by the engagement of the key 24 with the winding ratchet 21 until the tension has been sufiiciently deduced.

The front pressure rolls I are held against the platen ina similar manner bfy springs 15-, 16' mounted one tension shat 13" having a locking ratchet 1 9"and detent 10", and a ratchet 21". The free ends of the springs may enga e the roll-carrying shaft 8 to hold-it in the ownwa-rdlyopening slots 'in the forwardl extending amis- 6, lying behind the tenslon'shaft 13; This construction "makes the mechanism -more com-' pact and locates it closer to the platen, and opt of the way of other parts of the mac me. 1

i The provision of separate tension ,devices for'the respective series of feed ro'lls, en'- ables the operatorto' causeone series of feed rolls to press more firmly against the platen than does the other series, if desired.

The ressurerolls may be released by a release licy 26 provided upon the erid.of the platen frame and connected 'by a link 27 to a crank 28 formed 11 n a rock-shaft 29 extending-along the p aten below the rod 5. Therock shaft is provided withjflats 30 en- "gaged by release arms 31 connected to the shaft-carryingarms(E 7. i

Haying' thnsfdescribeil my invention, I ]a im;;:' .1: V

'-I;;In'= a t'ypcwrit-ing machine, the coinbination witlra platen and a plurality of feed rolls, of'a spring for urging the feed rolls against the platen, a rotatable tension .shaft \yith'=wh ich'the'spring is connected, anda releasable clutch for holding 'the'shaft against'accidental rotation. I

In a typewriting machine, the combination with'aplaten-and a feed roll, of a tensiolr tdevice for iefiecting -pressure of the roll:.against' the: platen, c'mnprising a rota-. table shaft, :1 spring on the shaft for press-- ing the roll againstvthepl'aten, and a lock for holding the shaft against rotation, the shaft being mm'ableendwisc to throw the lock into and out of operation. and having at its outer end a head or-part formed to receivc a key.

.lock for maintaining the shaft against aecidental rotation, to hold the springs at the adjusted tension.

5. In a typewriting machine, the combination with aplaten and a series of feed rolls, springs for effecting a uniform pressure 0 all the rolls against the platen, a shaft with which the springs are connected, the shaft capable of longitudinalas well as rotary movement, a stationary ratchet, and a detent on the shaft'nicshing with the stationary-ratchet to hold the shaft against back rotation and maintain the springs at their adjusted tension. V

6. In a typeivrit-in'g machine, the combination with a -pla ten a series of feed rolls, and springs for pressing the rolls against the platen, of a shaft with which the springs are connected, means forrotating the shaft in one d-irection, a stationary ratchet, and a detent carried by the shaft and engaging the ratchet to prevent accidental unwinding of the shaft, and permitting the winding thereof. I

7. In a typewriting machine, the combination with a platen frame and a laten, of a series of pressure rolls, springs or pressing .the rolls against the platen, a shaft controlling the tension of said springs, a lockmg ratchet on the frame releasably engaged by'a detent'mounted upon the tension regulating shaft to permit the shaft to be turned in one direction, and to prevent back rotation thereof, and a ratchet provided on the outer end of 'the shaft in position to be engaged by a key.

8. In a typewriting machine, the combination witha platen, of a series of paper-feed rolls mountcd upon a shaft to coiiperatc withthe platen, castin otf and restoring mechanism in which t w shaft is looselv mounted, and a spring engaging the shaft and effective to maintain it engaged with the casting oil and restoring mechanism and to press the serics'bfrolls against the platen.

9; In a'typewriting machine, the combination with a platen and a feed roll, of a tension device for effecting pressure of the rollagainst the platen, com rising a rotatable shaft, a set of indepem ant springs on the shaft for pressing the roll against; the

platen, and a lock for holding the shaft 136 against rotation; the shaft having at its outer end a head or part formed to receive a key.

10. In a typewriting machine, the combination with a laten and a set of rolls to run thereon, o a movableshaft on which said rolls are mounted, a second shaft having a set of springs thereon, said springs bearing upon said roll-shaft at points between the several rolls thereon, said spring shaft being rotatable to adjust the tension 7 of the springs, and means for detaining said spring shaft where adjusted.

, 11 In a typewriting machine, the combination with a platen and a laten frame, a rod being supported on sai platen frame, of arms pivoted on said rod, a pressure roll carried upon said arms to run upon the platen, and a shaft carrying a/sprin press the roll against the laten, said siaft rotatable to'adjust the tension of the s ring, and extending along the platen, an provided with bearings upon said platen frame, and having a detent.

12. In a typewriting machine, the combination with a platen and a laten frame, a rod being supported on said of two sets of arms pivoted on said rod, a pressure roll carried upon each set of said arms to run upon the platen, and rotatable shafts carrying springs to press the rolls against the platen, each of said shafts r0- tatable independently of the other to adjust the tension of its spring, a detent being provided for each shaft.

13. In a typewriting machine, the combination with a platen and a platen frame, a rod being supported on said platen frame, of-two sets of arms pivoted on said rod, a pressure roll carried upon each set of said arms to run upon the platen and rotatable shafts each carrying a'plurality of springs to ress the rolls against the platen, each of sai shafts rotatable independently of the other to adjust the tension of its springs;

a detent being provided for each shaft.

CHARLES GIBBS. Witnesses:

JOHN O. SEIFEBT, C. RIP'LEY.

platen frame, 1 

